2 * Copyright 2014, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
10 #include <sys/types.h>
18 * Tests we can setup an EBB on our child. Nothing interesting happens, because
19 * even though the event is enabled and running the child hasn't enabled the
20 * actual delivery of the EBBs.
23 static int victim_child(union pipe read_pipe, union pipe write_pipe)
27 FAIL_IF(wait_for_parent(read_pipe));
28 FAIL_IF(notify_parent(write_pipe));
30 /* Parent creates EBB event */
32 FAIL_IF(wait_for_parent(read_pipe));
33 FAIL_IF(notify_parent(write_pipe));
35 /* Check the EBB is enabled by writing PMC1 */
38 /* EBB event is enabled here */
39 for (i = 0; i < 1000000; i++) ;
44 int ebb_on_child(void)
46 union pipe read_pipe, write_pipe;
50 FAIL_IF(pipe(read_pipe.fds) == -1);
51 FAIL_IF(pipe(write_pipe.fds) == -1);
55 /* NB order of pipes looks reversed */
56 exit(victim_child(write_pipe, read_pipe));
59 FAIL_IF(sync_with_child(read_pipe, write_pipe));
61 /* Child is running now */
63 event_init_named(&event, 0x1001e, "cycles");
64 event_leader_ebb_init(&event);
66 event.attr.exclude_kernel = 1;
67 event.attr.exclude_hv = 1;
68 event.attr.exclude_idle = 1;
70 FAIL_IF(event_open_with_pid(&event, pid));
71 FAIL_IF(ebb_event_enable(&event));
73 FAIL_IF(sync_with_child(read_pipe, write_pipe));
75 /* Child should just exit happily */
76 FAIL_IF(wait_for_child(pid));
85 return test_harness(ebb_on_child, "ebb_on_child");